CHILD RESTRAINT SYSTEMS. MEASUREMENT OF BUCKLES EXPOSED TO LOADS OF 60-200 N

The purpose of this report has been to solve the problems in connection with the measurement of the opening force requirements of buckles under varying load conditions. An apparatus was constructed where the pressure speed on the buckle was 20-40 mm per minute. A circuit breaker eliminated the registration of the recoil effect and thus the apparatus only measured the real opening force. The results showed that the release force was strongly dependent upon the amount of load, and that it was possible to predict the increasing opening force requirements. With knowledge from previous studies of children's and adults' ability to open buckles, as well as the relationship between the release force of the buckle and load, the following opening force requirements were recommended: the weight of children is divided into 3 groups: Group I - 9-18 kg; Group II - 15-25 kg; Group III - 22-32 kg. The buckle opening force is defined as: Minimum at O load-40 N; Maximum at 200 N load-80 N for all three groups.

• Supplemental Notes:
  • Sponsored by the National Swedish Road Safety Office.
• Corporate Authors:

  Swedish National Road and Transport Research Institute (VTI)

  Linköping,   Sweden  SE-581 95
• Authors:
  • Arnberg, P W
  • Klasson, S
• Publication Date: 1976

Media Info

• Features: Figures; References; Tables;
• Pagination: 23 p.

Subject/Index Terms

• TRT Terms: Child restraint systems; Fasteners; Force; Loads; Measurement; Restraint systems
• Old TRIS Terms: Passenger restraints; Rearward facing child seat
• Subject Areas: Highways; Safety and Human Factors;

Filing Info

• Accession Number: 00148799
• Record Type: Publication
• Source Agency: National Safety Council Safety Research Info Serv
• Report/Paper Numbers: Report No. 89A
• Files: TRIS
• Created Date: Mar 30 1977 12:00AM